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/*
Copyright 2017 Gabriel Young <gabeplaysdrums@live.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <util/delay.h>
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"
#ifndef DEBOUNCING_DELAY
# define DEBOUNCING_DELAY 5
#endif
static uint8_t debouncing = DEBOUNCING_DELAY;
static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];
static matrix_row_t scan_col(void) {
return (
(PINC&(1<<7) ? 0 : ((matrix_row_t)1<<0)) |
(PINB&(1<<5) ? 0 : ((matrix_row_t)1<<1)) |
(PINB&(1<<4) ? 0 : ((matrix_row_t)1<<2)) |
(PINB&(1<<6) ? 0 : ((matrix_row_t)1<<3)) |
(PINB&(1<<1) ? 0 : ((matrix_row_t)1<<4)) |
(PINB&(1<<2) ? 0 : ((matrix_row_t)1<<5)) |
(PINB&(1<<3) ? 0 : ((matrix_row_t)1<<6)) |
(PINB&(1<<0) ? 0 : ((matrix_row_t)1<<7))
);
}
static void select_col(uint8_t col) {
switch (col) {
case 0: PORTD = (PORTD & ~0b01111011) | 0b00011011; break;
case 1: PORTD = (PORTD & ~0b01111011) | 0b01000011; break;
case 2: PORTD = (PORTD & ~0b01111011) | 0b01101010; break;
case 3: PORTD = (PORTD & ~0b01111011) | 0b01111001; break;
case 4: PORTD = (PORTD & ~0b01111011) | 0b01100010; break;
case 5: PORTD = (PORTD & ~0b01111011) | 0b01110001; break;
case 6: PORTD = (PORTD & ~0b01111011) | 0b01100001; break;
case 7: PORTD = (PORTD & ~0b01111011) | 0b01110000; break;
case 8: PORTD = (PORTD & ~0b01111011) | 0b01100000; break;
case 9: PORTD = (PORTD & ~0b01111011) | 0b01101000; break;
case 10: PORTD = (PORTD & ~0b01111011) | 0b00101011; break;
case 11: PORTD = (PORTD & ~0b01111011) | 0b00110011; break;
case 12: PORTD = (PORTD & ~0b01111011) | 0b00100011; break;
case 13: PORTD = (PORTD & ~0b01111011) | 0b01111000; break;
case 14: PORTD = (PORTD & ~0b01111011) | 0b00010011; break;
case 15: PORTD = (PORTD & ~0b01111011) | 0b01101001; break;
case 16: PORTD = (PORTD & ~0b01111011) | 0b00001011; break;
case 17: PORTD = (PORTD & ~0b01111011) | 0b00111011; break;
}
}
void matrix_init(void) {
/* Row output pins */
DDRD |= 0b01111011;
/* Column input pins */
DDRC &= ~0b10000000;
DDRB &= ~0b01111111;
PORTC |= 0b10000000;
PORTB |= 0b01111111;
for (uint8_t i=0; i < MATRIX_ROWS; i++)
matrix[i] = matrix_debouncing[i] = 0;
matrix_init_quantum();
}
uint8_t matrix_scan(void) {
for (uint8_t col = 0; col < MATRIX_COLS; col++) {
select_col(col);
_delay_us(3);
matrix_row_t col_scan = scan_col();
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
bool curr_bit = col_scan & (1<<row);
if (prev_bit != curr_bit) {
matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
debouncing = DEBOUNCING_DELAY;
}
}
}
if (debouncing) {
if (--debouncing)
_delay_ms(1);
else
for (uint8_t i = 0; i < MATRIX_ROWS; i++)
matrix[i] = matrix_debouncing[i];
}
matrix_scan_quantum();
return 1;
}
inline matrix_row_t matrix_get_row(uint8_t row) {
return matrix[row];
}
void matrix_print(void) {
#ifndef NO_PRINT
print("\nr\\c ABCDEFGHIJKLMNOPQR\n");
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
matrix_row_t matrix_row = matrix_get_row(row);
xprintf("%02X: ", row);
for (uint8_t col = 0; col < MATRIX_COLS; col++) {
bool curr_bit = matrix_row & (1<<col);
xprintf("%c", curr_bit ? '*' : '.');
}
print("\n");
}
#endif
}
uint8_t matrix_key_count(void) {
uint8_t count = 0;
for (uint8_t row = 0; row < MATRIX_ROWS; row++)
count += bitpop32(matrix[row]);
return count;
}
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